磷和外源生长素对澳洲坚果幼苗排根发生及其磷素利用的影响  

Effects of phosphorus and exogenous auxin on cluster root production and phosphorus utilization of macadamia seedlings

作　　者：覃潇敏 潘浩男 环秀菊 周春衡 何铣扬 王文林 郑树芳 丁家东 覃振师 QIN Xiao-min;PAN Hao-nan;HUAN Xiu-ju;ZHOU Chun-heng;HE Xian-yang;WANG Wen-lin;ZHENG Shu-fang;DING Jia-dong;QIN Zhen-shi(Guangxi South Subtropical Agricultural Science Research Institute,Longzhou Guangxi 532415)

机构地区：[1]广西南亚热带农业科学研究所,广西龙州532415

出　　处：《中国土壤与肥料》2024年第5期48-53,共6页Soil and Fertilizer Sciences in China

基　　金：广西农业科学院基本科研业务专项项目(桂农科2023YM08,桂农科2023YM21,桂农科2023YM22)。

摘　　要：通过水培试验,探讨磷素和外源生长素对澳洲坚果幼苗排根产生量与生理特性及其磷素利用的影响。结果表明,与正常供磷处理(PN)相比,低磷处理(PL)下澳洲坚果幼苗排根数量显著增加73.94%,也显著促进排根和非排根有机酸的分泌以及增强酸性磷酸酶活性,并且有机酸分泌量增加主要以柠檬酸和苹果酸为主。外源生长素萘乙酸(NAA)的施用也显著增加了低磷和正常供磷处理下澳洲坚果幼苗排根数量,显著促进根系(排根和非排根)有机酸的分泌,同样以柠檬酸和苹果酸分泌增加为主;而生长素极性运输抑制剂萘基邻氨甲酰苯甲酸(NPA)施用后则抑制了排根的产生及根系有机酸的分泌。此外,低磷处理下,施用NAA后澳洲坚果幼苗排根和非排根酸性磷酸酶活性也分别显著增强了13.70%和30.50%,而NPA施用后排根和非排根酸性磷酸酶活性则分别显著降低20.67%和25.98%。本试验条件下,低磷和施用生长素通过促进澳洲坚果幼苗排根形成及其生理特性改变,增加澳洲坚果幼苗的磷素吸收。A hydroponic experiment was conducted to investigate the effects of phosphorus and exogenous auxin on production number of cluster root,physiological characteristics and phosphorus utilization of macadamia seedlings.The results showed that,compared with normal levels of phosphorus supply,low phosphorus treatment significantly increased the number of cluster root in macadamia seedlings by 73.94%,and promoted the exudation of organic acids and enhanced acid phosphatase activity in cluster and non-cluster roots,and the increase in organic acid exudation was mainly dominated by citric and malic acids.The application of Naphthylacetic acid(NAA)also significantly increased the number of cluster root in macadamia seedlings under low and normal phosphorus treatments,and significantly promoted the exudation of organic acids in roots(cluster and non-cluster roots),and which mainly increased the exudation of citric and malic acids;while the application of Naphthyl o-carbamoylbenzoic acid(NPA)inhibited the generation of cluster root and the exudation of organic acids from roots.In addition,application of NAA also significantly increased the acid phosphatase activity in cluster and non-cluster roots of macadamia seedlings by 13.70%and 30.50%under low phosphorus treatment,while NPA application significantly decreased the acid phosphatase activity by 20.67%and 25.98%,respectively.In this experiment,low phosphorus and auxin application increased the phosphorus uptake of macadamia seedlings by promoting the cluster root formation and changing its physiological characteristics.

关 键 词：磷素 生长素 澳洲坚果 排根 磷含量 

分 类 号：S664.9[农业科学—果树学]